중금속 오염토양에서 두과 녹비작물의 단기재배 및 환원이토양 화학성에 미치는 영향

Abstract

BACKGROUND: Recent studies for heavy metalstabilization in soil were mainly focused on finding out newmaterials and its efficiency. But, such a stabilizationmethod can cause disturbance to soil, leading improperenvironment for agriculture. The object of this study was todemonstrate the effect of the incorporation of green manurecrops on heavy metal-contaminated soil. METHODS AND RESULTS: Soil contaminated withheavy metals was collected from the agricultural soilsaffected by the abandoned mine. Lime stone was selectedand treated to contaminated soil. Three kinds of legumegreen manure crops; Alfalfa (Medicago sativa), Hairy vetch(Vicia villosa), Red clover (Trifolium pratense) weresubsequently cultivated in greenhouse condition. It wasfound that lime stone increased soil pH and decreased theamount of heavy metal absorption by green manure. Theapplication of green manure residues on soil increased soilpH and inorganic nitrogen. CONCLUSION: The C/N ratio of three green manures waslow, indicating fast decomposition rate, resulting innitrogen supplement, consequently. Considering the pointthat the soil was used for agricultural purpose, it wasrecommended that hairy vetch and red clover werepreferred. Nevertheless, the heavy metal availability wasalso increased. Thus, it seemed that further study wasneeded to confirm that how long maintain a phenomenon.